The Siemens Dual Function Circuit Breakers combine a Class A 5mA GFCI and Combination Type AFCI, offering protection against both Arc Faults and Ground Faults. This, coupled with the new Self-Test feature, makes it the first in class in electrical safety for pool and hot tub owners. The Siemens Dual Function GFCI breaker is a combination of these two devices that provides both cost savings and ensures that only the best protection is given to your pool and hot tub at all times.